/* Copyright (c) 2011, Yinli ZHU
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the <organization> nor the names of its 
 *       contributors may be used to endorse or promote products derived 
 *       from this software without specific prior written permission.
 *       
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Yinli ZHU BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package qjson.generators;

import java.lang.reflect.InvocationTargetException;
import java.util.List;

import org.apache.commons.beanutils.PropertyUtils;
import org.json.JSONException;
import org.json.JSONObject;

import qjson.analysers.SimpleJSONAnalyser;

public class SimpleJSONGenerator {
  private static SimpleJSONGenerator instance;
  
  private SimpleJSONGenerator() {
    
  }
  
  public static SimpleJSONGenerator getInstance() {
    if (instance == null) {
      instance = new SimpleJSONGenerator();
    }
    
    return instance;
  }
  
  public JSONObject generateJSON(Object obj, SimpleJSONAnalyser analyser) {
    List<String> publicFields = analyser.getPublicFields();
    List<String> privateFields = analyser.getPrivateFields();
    
    JSONObject json = new JSONObject(obj, publicFields.toArray(new String[publicFields.size()]));
    for (String field : privateFields) {
      try {
	json.put(field, PropertyUtils.getSimpleProperty(obj, field));
      } catch (IllegalAccessException e) {
	e.printStackTrace();
      } catch (InvocationTargetException e) {
	e.printStackTrace();
      } catch (NoSuchMethodException e) {
	e.printStackTrace();
      } catch (JSONException e) {
	e.printStackTrace();
      }
    }
    
    return json;
  }
}
